161761274944 has 28 divisors (see below), whose sum is σ = 323039604364. Its totient is φ = 80365469184.

The previous prime is 161761274903. The next prime is 161761274977. The reversal of 161761274944 is 449472167161.

It can be written as a sum of positive squares in 2 ways, for example, as 77261761600 + 84499513344 = 277960^2 + 290688^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161761274891 and 161761274900.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8039379 + ... + 8059474.

Almost surely, 2^161761274944 is an apocalyptic number.

It is an amenable number.

161761274944 is a deficient number, since it is larger than the sum of its proper divisors (161278329420).

161761274944 is a wasteful number, since it uses less digits than its factorization.

161761274944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16099022 (or 16099012 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 52.

The spelling of 161761274944 in words is "one hundred sixty-one billion, seven hundred sixty-one million, two hundred seventy-four thousand, nine hundred forty-four".